Fibre optical wavelength-converter employing cross-phase modulation and low-threshold non-adiabatic Raman compression

D.A. Chestnut, J.R. Taylor
2003 Electronics Letters  
frequency shift and insertion losses are greatly improved. The frequency shift reaches 1.33 GHz under 3.7V bias voltage and the insertion losses vary between -2.7 and -7 dB. The filter selectivity is 57 under 3.7 V bias and 39 without bias voltage. If we want to limit insertion losses to 4 dB, the frequency tuning equals 300 MHz, which is two times greater than the filter 3 dB bandwidth (160 MHz). Conclusion: We have proposed a new kind of high selectivity tunable passband filters. We have
more » ... lters. We have demonstrated two methods of tuning command, one mechanical and the other electrical. In the latter case, simulations show that an important tuning, comparable to the mechanical case, can be obtained using high-quality commerciallyavailable Schottky diodes. Actually, any type of nonlinearity that perturbs the impedance or the electrical length of the defect could serve to command the filter. For example, one can employ ferroelectrics substrates, piezoelectric components or MEMS. It is foreseen that discrete tunable filters made with MEMS could work up to 60 GHz.
doi:10.1049/el:20030736 fatcat:bbmbmfmdv5cnbl4gpf3fazoreq